This has been bugging me. Had to swap back to my SK3 due to financial ... BlackBerry Pearl forum

Why Does My Battery Last Longer When I Have a Data Plan?

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This has been bugging me. Had to swap back to my SK3 due to financial issues. I want to use both phones one day.

Anyway the issue is this: Everytime I disconnect the data plan, my bb battery only lasts 1 day. Is the bb still receiving a signal somehow even if I have wireless and data roaming off. Why???? What can I do to keep it lasting more than one day until I can afford data on both phones?

As long as the radio portion of the BB is turned on, it will tx/rx with your system. Not sure about why your battery lasts longer with data on. Seems like it would be the other way around.

In the settings for the device, you can disable the green/red lights for in and out of coverage, which will extend your battery life somewhat.

It's now 1 AM on Sunday. Here's what happened:

I turned my BB off 2 nights ago (Friday night) before I went to bed (I have Auto On/Off set to turn off at 3 AM Central and turn back on at 4 AM Central to reboot the BB). I left it unplugged as it had a full battery. Yesterday morning (Saturday morning) when I woke up, there was only 15% battery power left. I did absolutely nothing to the BB as I was not home to do anything with it (no emergency calls, texts, games, MP3 usage, NOTHING).

The LED Coverage Indicator is off. Options>Mobile Network>Data Services is set to Off. The "Turn Wireless On/Off" icon on the home screen reads "Turn Wireless On" meaning wireless is Off.

Is it possible that the battery meter is just reading wrong? If your at 15% will it die in a few mins hours or does it las just as long as it should with 15%
I had a problem with my 7130g that I would charge it up and the batt meter would read 1% but it would last as long as a full charge should, I just didn't have a visual to tell how much life I had
Just a though...

This is strange to say the least. I would be more inclined to believe what jonny stated as the BB is basically designed to work with a data plan since that is where its features and usefulness really come alive.